CAD 631L Noise-Cancelling Dynamic Palmheld Microphone w/ Talk Switch

The CAD 631L (formerly Astatic 631L) is a noise-cancelling dynamic palmheld microphone engineered for close-talking in high-noise environments. With its rugged teardrop housing, thumb-operated talk switch, and voice-optimized response, the 631L is a proven choice for dispatch, industrial paging, transportation, public safety, and other systems where clear, intelligible speech is critical.

Key Features

• Noise-Cancelling Dynamic Element: Specially designed capsule minimizes ambient noise and focuses on the speaker’s voice for maximum intelligibility in loud environments.
• Close-Talk Design with Lip Guard: Soft, curved lip guard promotes consistent mic-to-mouth spacing, helping maintain stable levels and tone from user to user.
• DPDT Push-to-Talk Switch: High-cycle DPDT (double-pole, double-throw) push-to-talk switch that keys the mic and provides external contact closure for transmitters, paging systems, or control circuits.
• Heavy-Duty Coiled Cord: Permanently attached heavy-duty coiled cord (approx. 6') using four-conductor, two-shielded cable with stripped and tinned ends for flexible wiring options.
• Low-Impedance Balanced Output: 180-ohm low-impedance design supports long cable runs and reduces hum and interference in professional installations.
• Ergonomic Teardrop Housing: Palm-sized, impact-resistant shell offers a comfortable grip and stands up to daily abuse in dispatch, plant, and mobile environments.
• Rugged Polyester Diaphragm: Dynamic cartridge uses a durable polyester diaphragm that resists moisture, temperature extremes, and many common industrial chemicals.
• Hang-Up Clip Included: Matching hang-up clip allows the mic to be securely stowed on dashboards, consoles, and equipment racks when not in use.

Ideal Applications

• Two-way radio dispatch and control rooms
• Industrial and plant paging systems
• Public safety, utility, and transportation fleets
• Warehouse, factory, and loading dock communications
• Bus, rail, and shuttle stop call stations
• High-noise drive-thru and intercom installations

Technical Specifications

• Operating Principle: Moving coil dynamic
• Pattern Type: Noise-cancelling, close-talk
• Frequency Response: 200 Hz – 5.5 kHz (optimized for speech)
• Sensitivity: -62 dBV (0.8 mV) @ 1 Pa (typical)
• Impedance: 180 ohms, low impedance balanced
• Switch Type: DPDT, momentary push-to-talk, factory wired normally open
• Cable: Approx. 6' heavy-duty coiled, four-conductor, two-shielded, stripped and tinned ends
• Housing Material: High-impact plastic (teardrop-style palm housing)
• Color: Black
• Connector: Unterminated pigtail (field-wired by installer)

What’s Included

• CAD 631L noise-cancelling dynamic palmheld microphone
• Permanently attached heavy-duty coiled cord
• Hang-up clip

Why Choose the CAD 631L?

When communications have to cut through background noise, the CAD 631L delivers. Its noise-cancelling dynamic design, close-talk lip guard, durable construction, and dependable push-to-talk switch make it ideal for dispatchers, drivers, and operators who rely on clear voice transmission every day. From industrial plants and warehouses to transportation fleets and public safety systems, the 631L is built for long-term, trouble-free service.